Laing O’Rourke plc is the largest privately owned construction firm in the UK.

The Company was founded by Ray O'Rourke in 1978: it was originally based in East London and was known as R. O'Rourke & Son.

R. O'Rourke established a comprehensive construction capability in 2001 when it bought Laing Construction from John Laing plc for £1: the name of the Company was changed to Laing O'Rourke.

In 2004 the Company acquired Crown House Engineering, a mechanical & electrical engineering business.

Laing O'Rourke went on to expand its operations in Australia in 2006 when it acquired Barclay Mowlem.

Source: Wikipedia